CWS operates a buy-back center at 1820 10th St, Oakland, CA 94607. A top price is paid for acceptable buy-back materials such as cardboard, newspaper, and white, colored and coated mixed paper. These materials are only accepted in bulk amounts of 100lbs or more.

The center is open to the public five days a week, Mon. - Fri., from 8:00 AM to 5:00 PM, and pick up service is available for businesses.